Search
Now showing items 1-10 of 313
Effects of social dominance on milk production and grazing behaviour of lactating dairy cows : A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
(Lincoln University, 2019)
In this study, three experiments were conducted to determine factors influencing social dominance in lactating, grazing dairy cows. Additionally, we investigated the effect of separating cows, based on social dominance, ...
Assessment of the application of gibberellins to increase productivity and reduce nitrous oxide emissions in grazed grassland
(Elsevier, 2015-09-01)
© 2015 Elsevier B.V. Emissions of nitrous oxide from grassland systems are attributable largely to the use of nitrogen fertilisers and the excreta deposited by grazing animals. There is increasing interest in using ...
Balancing water-quality threats from nutrients and production in Australian and New Zealand dairy farms under low profit margins
(CSIRO Publishing, 2017-06)
The loss of nitrogen (N) and phosphorus (P) from dairy-farmed land can impair water quality. Efforts to curtail these losses in Australia and New Zealand (Australasia) have involved a mixture of voluntary and regulatory ...
The potential in-situ antimicrobial ability of Myrtaceae plant species on pathogens in soil
(Elsevier, 2016-05-01)
Concerns that land application of organic waste may introduce microbial contaminants into the environment could be mitigated by growing plants with antiseptic properties in waste-amended soil. We investigated the potential ...
Extreme phosphorus losses in drainage from grazed dairy pastures on marginal land
(American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America., 2014-11-11)
With the installation of artificial drainage and large inputs of lime and fertilizer, dairy farming can be profitable on marginal land. We hypothesized that this will lead to large phosphorus (P) losses and potential surface ...
Nitrous oxide fluxes, soil oxygen, and denitrification potential of urine- and non-urine-treated soil under different irrigation frequencies
(American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc., 2016-07)
© American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America. 5585 Guilford Rd., Madison, WI 53711 USA. All rights reserved. Despite increased use of irrigation to improve forage ...
The spatial coverage of dairy cattle urine patches in an intensively grazed pasture system
(Cambridge University Press, 2010-12-23)
Accurate field data on the paddock area affected by cow urine depositions are critical to the estimation and modelling of nitrogen (N) losses and N management in grazed pasture systems. A new technique
using survey-grade ...
Effect of DGAT1 variant (K232A) on milk traits and milk fat composition in outdoor pasture-grazed dairy cattle
(Taylor & Francis on behalf of the Royal Society of New Zealand, 2019-03-20)
An amino acid substitution (K232A) in the enzyme diacylglycerol acyl-CoA acyltransferase 1 (DGAT1) has been reported to explain variation in milk traits and milk fatty acid (FA) profile. In this study, associations between ...
A review of the policies and implementation of practices to decrease water quality impairment by phosphorus in New Zealand, the UK, and the US
(Springer Netherlands, 2016-04)
© 2015, Springer Science+Business Media Dordrecht. The improper use of phosphorus (P) on agricultural land in developed countries is related to P losses that impair surface water quality. We outline policy in New Zealand, ...
Relationship between the severity, persistence of soil water repellency and the critical soil water content in water repellent soils
(Elsevier, 2014-06)
Soil water repellency (SWR) causes reduced soil water storage and enhanced runoff and reduced ecosystem productivity. As such, characterization of SWR is a prerequisite for effective environmental management. The objectives ...